Which of the following prevent the collapsing of the trachea?

  • A
    Muscles
  • B
    Diaphragm
  • C
    Ribs
  • D
    Cartilaginous rings

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The epithelium in the bronchioles is

What are the functions performed by the nasal cavity when air passes through it?

Identify the component of the respiratory system which displays the features given below and choose the correct option:
$I.$ Double layered
$II.$ Fluid contained in it reduces the friction on the lung surface
$III.$ Its outer layer is in contact with the thoracic wall
$IV.$ Its inner layer is in contact with the lungs

At which level of thoracic vertebra does the trachea divide?

Vocal cords are present in . . . . . . .

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